Slim, you are throwing some major generalities out there. The dog Chinaman was conditioned on a carpet mill and every dog that his owner had was. If used properly and it is a well made freerunnin mill they have their uses. They do tend to build bunchier muscles when used too heavily.
You are right, they do have their uses, in the hands of somebody who knows how to use it. I probably should have clarified my point better in saying that you can't leave a dog on a carpet mill near as long as you would a slatmill. As for Chinaman, I don't know this for a fact, but I would assume that Chinaman wasn't being conditioned to go for very long (cause he probably didn't have to), lol.
Yeah you have to be very careful on a carpet mill it you can and will mess one up on a hurry if you dont know what you are doing . You can work a dog on a mill for 30 days and I gaurntee you if you dont know what you are doing he will be in worse shape than he was before you started !
The man that condition Chinaman am sure knew excatly what he was doing so it was no big deal but to a rookie its a real problem . Also that swimming a dog is a good thing but if you dont watch out you dog will become muscle bound and heat up more so that he did before because muscle carrys lots of heat .
Best thing to do for a hog dog in my opinion is just get out on a four wheeler and let him trot beside it and just watch him so he does not get to hot a good way to do this is to watch his tongue once it starts to flare and get wide you better stop in a hurry as long as its long and hangin down you ok also you need to watch the tip of the tounge once it starts to flare up on the tip you are fixin to be in big trouble .